CHM 13 Ppt.1

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1. chemical equilibrium
the state achieved when the rates of the forward and reverse reactions are equal and the concentrations of the reactants and products remain constant
2. Equilibrium between phases is known as __
physical equilibrium
3. For a general reversible reaction:
aA + bB <--> cC + dD
4. Equalibrium equation
• Kc= [C]c[D]d/ [A]a[B]b
• where hte numerator is the product
• where the denominator is the reactants
• Kc= equilibrium constant
5. The __ and the __ are for the chemical equation as __
• equilibrium constant
• equilirbrium constant expression
• written
6. What are the exponents?
they are going to be the exponents
7. Homogeneous equilibrium
when all reacting species are in hte same phase, all reactants and products are included in the expression
8. Amounts of components are given as __ or __ of a gas.
• molarity
• partial pressure
9. Kp equation
• Kp= (P NO2)^2 / PN2O4
• where P is the partial pressure
10. Euation to convert between Kc and Kp
• Kp=Kc (RT)^deltan
• where delta n= mole gas products- mole of gas reactants
• R is the gas constant, 0.08206
• T is temp in K
11. Heterogeneous equilibrium
when reacting species are in different phases, solid and liquid phases are excluded from the expression because their concentrations "do not change"
12. Write the equilibrium equation for each of the following reactions?
1) CO2 (g) + C (s) <--> 2 CO
1) Kc = [CO]2/ [CO2]
13. Write the equilibrium equation for each of the following reactions?
2) Hg (l) + Hg 2+ (aq) <--> Hg22+ (aq)
k= [Hg22+ ]/ [Hg2+]
14. We can make the following generalizations concerning the composition of equilibrium mixtures
If Kc > 10^3, __
• products predominate over reactants.
• If Kc is very large, the reaction is said to proceed to completion
15. We can make the following generalizations concerning the composition of equilibrium mixtures
If Kc is in the range of 10^-3 to 10^3, __
appreciable concentrations of both reactants and products are present
16. We can make the following generalizations concerning the composition of equilibrium mixtures
If Kc < 10^-3, __
reactants predominate over products. If Kc is very small, the reaction proceeds hardly at all
17. Reaction Quotient
Qc= [C]t^c [D]t^d / [A]t^a [B]t^b
18. The __, is defined in the same way as the __, except that the concentrations in Qc are not necessarily __.
• reaction quotient (Qc)
• equilibrium constant (Kc)
• equilibrium values
19. How is the reaciton quotient (Qc) obtianed?
by substituting initial concentraitons into the equilibrium constant; predicts reaction direction
20. Qc > Kc
system proceeds to form reactants
21. Qc < Kc
System proceeds to form products
22. Qc = Kc
system is at equilibrium
23. Knowing Kc allows us to calculate __ from __. We use the __.
• equilibrium concentrations
• initial concentratiions
• Initial Change Equilibrium Method
 Author: DesLee26 ID: 206933 Card Set: CHM 13 Ppt.1 Updated: 2013-03-19 21:22:45 Tags: CHM 112 Folders: Description: Ch 13 Show Answers: